// SERVER-393 Test indexed matching with $exists.

t = db.jstests_exists6;
t.drop();

t.ensureIndex( {b:1} );
t.save( {} );
t.save( {b:1} );
t.save( {b:null} );

assert.eq( 2, t.find({b:{$exists:true}}).itcount() );
assert.eq( 2, t.find({b:{$not:{$exists:false}}}).itcount() );
assert.eq( 1, t.find({b:{$exists:false}}).itcount() );
assert.eq( 1, t.find({b:{$not:{$exists:true}}}).itcount() );

// Now check existence of second compound field.
t.ensureIndex( {a:1,b:1} );
t.save( {a:1} );
t.save( {a:1,b:1} );
t.save( {a:1,b:null} );

assert.eq( 2, t.find({a:1,b:{$exists:true}}).itcount() );
assert.eq( 2, t.find({a:1,b:{$not:{$exists:false}}}).itcount() );
assert.eq( 1, t.find({a:1,b:{$exists:false}}).itcount() );
assert.eq( 1, t.find({a:1,b:{$not:{$exists:true}}}).itcount() );
